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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2014

Equity [Abstract]

Stock option plan activity

The following is a summary of the Company’s stock option plan activity and related information:

	Shares			Weighted- Average Exercise Price				Weighted-Average Remaining Contractual Term in Years		Aggregate Intrinsic Value (In thousands)
Balance as of December 31, 2013	1,746,709			$	16.79			7.6		$	62,705
Granted	366,184			73.81
Exercised	(233,929	)		15.72
Forfeited	(49,967	)		16.69
Cancelled	(3,814	)		84.38
Balance as of June 30, 2014	1,825,183			28.23				7.7		$	66,386
Exercisable as of June 30, 2014	945,222			16.30				6.8		$	43,474
Options vested and expected to vest as of June 30, 2014	1,825,183			28.23				7.7		$	66,386

Restricted stock activity

Restricted stock activity for the six months ended June 30, 2014 was as follows:

	Shares			Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2013	115,386			$	21.93
Granted	41,671			72.50
Vested	(74,079	)		25.24
Cancelled	(3,972	)		18.42
Nonvested at June 30, 2014	79,006			$	45.68

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- Definition

Tabular disclosure of the changes in outstanding nonvested restricted stock units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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